Compatible with all ERA Wireless Alarm Systems, the ESS260B Solar Charged Siren and LED Strobe is easy to install, with no mains wiring or main power required. Any ERA Wireless alarm system can be extended to include this outdoor 110dB siren at any time. The Siren can also be used as a stand-alone system by simply adding optional ERA accessories such as PIR Sensors, Magnetic Sensors and Remote Controls.